Systematic design and realization of the optical feedforward transmitter based on microwave circuit modeling

We have systematically designed and realized the optical feedforward transmitter using microwave circuit model of distributed-feedback laser diode (DFB LD) based on rate equations. Through the system-level simulation for the optical feedforward method, the nonlinearity of DFB-LD is analyzed, and the optimized characteristics of the RF components in the system are confirmed by using a microwave simulator. The experimental and simulated results show the reduced distortion products and enhanced spurious-free dynamic ranges are in good agreement at 2.4 GHz. These results are analyzed as the evaluation parameters for the miniaturization and optimization of the feedforward compensation method in radio-over-fiber systems. (C) 2008 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 192-195, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24007